I used to be the same throughout my entire first year of college. I'd always had very low self esteem, so I acted like no one wanted me around, because it's all I'd ever known. On my first group project, a group asked me to do the project with them and for some reason I felt so humiliated. I thought they only invited me because they felt sorry for me. I even asked the professor if I could do the project on my own because I didn't feel comfortable with my group. She went as far as calling each member of the group for a meeting and asked them if they were okay with having me on their group, and told them that I'd asked her to do the project on my own. Long story short: I did the project with them and we ended up becoming friends. A couple months later, we had already grown kind of close, so I told them how I felt in the beginning, that i didn't feel welcome on their group, or anywhere for that matter. And they told me something that I never forgot. They said that they always wanted me around, but that I intimidated them because I always seemed so serious and closed off.

TL;DR: maybe your classmates are only intimidated by you. Maybe you're too serious or look like you don't want to be approached. They might fear being rejected just as much as you.

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